Semiconductor devices including infrared sensor with infrared photodiode and color sensor with color photodiode

Abstract

A semiconductor device may include a first sensor configured to sense light having a wavelength within a first wavelength range from incident light and generates a first electrical signal based on the sensed light and a second sensor configured to sense light having a wavelength within a second, different wavelength range from the incident light and generates a second electrical signal based on the sensed light. The first and second sensors may be electrically connected to each other via an intermediate connector, and the first sensor and the second sensor may share a pixel circuit that is electrically connected thereto via the intermediate connector. The first and second wavelength ranges may include infra-red and visible wavelength ranges, respectively. The first and second wavelength ranges may include different visible wavelength ranges.

What is claimed is: 
     
       1. An image sensor, comprising:
 an infrared sensor including a first photodiode, a second photodiode, a third photodiode, and a first floating diffusion node; 
 a color sensor on the infrared sensor, the color sensor including a first color photodiode under a red color filter, a second color photodiode under a green color filter, a third color photodiode under a blue color filter, and a second floating diffusion node; 
 an intermediate connector connected to the first floating diffusion node and the second floating diffusion node; and 
 a pixel circuit connected to the infrared sensor and the color sensor via the intermediate connector, 
 wherein the first floating diffusion node is configured to receive electrical signals from each of the first photodiode, the second photodiode, and the third photodiode, and wherein the second floating diffusion node is configured to receive electrical signals from each of the first color photodiode, the second color photodiode, and the third color photodiode, such that the intermediate connector is an individual connector that is electrically coupled to each of the first, second, and third color photodiodes of the color sensor and the first, second, and third photodiodes of the infrared sensor and is configured to direct respective electrical signals from each of the first, second, and third color photodiodes of the color sensor and the first, second, and third photodiodes of the infrared sensor to the pixel circuit, 
 wherein the infrared sensor is configured to sense an infra-red portion of an incident light and the color sensor is configured to sense a visible portion of the incident light. 
 
     
     
       2. The image sensor of  claim 1 , wherein the color sensor further includes a fourth color photodiode under a separate green color filter and the second floating diffusion node is configured to receive electrical signals from the fourth color photodiode. 
     
     
       3. The image sensor of  claim 1 , wherein the intermediate connector includes a metal junction, the metal junction configured to electrically connect the first floating diffusion node and the second floating diffusion node. 
     
     
       4. The image sensor of  claim 3 , wherein the metal junction includes Cu—Cu bonding. 
     
     
       5. The image sensor of  claim 1 , wherein the pixel circuit is laminated with the infrared sensor and the color sensor. 
     
     
       6. The image sensor of  claim 5 , wherein the pixel circuit includes a third floating diffusion node, the third floating diffusion node configured to receive an electrical signal from the first floating diffusion node or an electrical signal from the second floating diffusion node via the intermediate connector. 
     
     
       7. An image sensor, comprising:
 an infrared sensor including a first photodiode and a first floating diffusion node, the infrared sensor being configured to sense an infra-red portion of an incident light; 
 a color sensor on the infrared sensor, the color sensor including a first color photodiode, a second color photodiode, a third color photodiode, a fourth color photodiode, and a second floating diffusion node; 
 an intermediate connector connected to the first floating diffusion node and the second floating diffusion node; and 
 a pixel circuit connected to the infrared sensor and the color sensor via the intermediate connector, and wherein the second floating diffusion node is configured to receive electrical signals from each of the first color photodiode, the second color photodiode, the third color photodiode, and the fourth color photodiode, such that the intermediate connector is an individual connector that is electrically coupled to each of the first, second, third, and fourth color photodiodes of the color sensor and the first photodiode of the infrared sensor and is configured to direct respective electrical signals from each of the first, second, third, and fourth color photodiodes of the color sensor and the first photodiode of the infrared sensor to the pixel circuit, 
 wherein the color sensor is configured to sense a visible portion of the incident light. 
 
     
     
       8. The image sensor of  claim 7 , further comprising:
 a bayer pattern of color filters, each color filter of the bayer pattern of color filters overlapping a separate, respective photodiode of the first color photodiode, the second color photodiode, the third color photodiode, and the fourth color photodiode. 
 
     
     
       9. The image sensor of  claim 7 , further comprising:
 a red color filter overlapping the first color photodiode, 
 a green color filter overlapping the second color photodiode, 
 a blue color filter overlapping the third color photodiode, and 
 a white color filter overlapping the fourth color photodiode. 
 
     
     
       10. The image sensor of  claim 8 , wherein the color sensor has higher resolution than the infrared sensor. 
     
     
       11. The image sensor of  claim 9 , wherein the color sensor has higher resolution than the infrared sensor. 
     
     
       12. The image sensor of  claim 8 , wherein
 the infrared sensor further includes a second photodiode, a third photodiode, and a fourth photodiode, and 
 the first floating diffusion node is configured to receive electrical signals from the first photodiode, the second photodiode, the third photodiode, and the fourth photodiode. 
 
     
     
       13. The image sensor of  claim 9 , wherein
 the infrared sensor further includes a second photodiode, a third photodiode and a fourth photodiode, and 
 the first floating diffusion node is configured to receive electrical signals from each of the first photodiode, the second photodiode, the third photodiode, and the fourth photodiode, such that the intermediate connector is electrically coupled to each of the first, second, third, and fourth color photodiodes of the color sensor and the first, second, third, and fourth photodiodes of the infrared sensor and is configured to direct respective electrical signals from each of the first, second, third, and fourth color photodiodes of the color sensor and the first, second, third, and fourth photodiodes of the infrared sensor to the pixel circuit. 
 
     
     
       14. The image sensor of  claim 12 , wherein the color sensor has a same resolution as the infrared sensor. 
     
     
       15. The image sensor of  claim 13 , wherein the color sensor has a same resolution as the infrared sensor. 
     
     
       16. The image sensor of  claim 7 , wherein the intermediate connector includes a metal junction, the metal junction configured to electrically connect the first floating diffusion node and the second floating diffusion node. 
     
     
       17. The image sensor of  claim 16 , wherein the metal junction includes Cu—Cu bonding. 
     
     
       18. The image sensor of  claim 7 , wherein the pixel circuit is laminated with the infrared sensor and the color sensor. 
     
     
       19. The image sensor of  claim 18 , wherein the pixel circuit includes a third floating diffusion node, the third floating diffusion node configured to receive an electrical signal from the first floating diffusion node or an electrical signal from the second floating diffusion node via the intermediate connector.